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检索条件"主题词=Change detection algorithms"

共 1584 条记录，以下是331-340 订阅

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change detection Algorithm Using Multitemporal SPOT Images

Change Detection Algorithm Using Multitemporal SPOT Images

引用

International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE)

作者： Zhaohui Yang Xinqiang Qian School of Environmental Science & Engineering Suzhou University of Science and Technology Suzhou China

change detection algorithm using multitemporal SPOT images is proposed. Firstly, multitemporal images are registrated with Harris-Laplace feature points. Then, based on increment and decrement of pixel's value in four directions, candidate change region is estimated by improved increment sign correlation method. Finally, change area is output according to relationship between global difference rate and local difference rate. The experimental results show that this algorithm is simple and efficient, which can obtain accurate and integrated change detection result.

关键词： Correlation change detection algorithms Image registration Brightness Feature extraction Detectors detection algorithms

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Architecture for Parallel Crawling and Algorithm for change detection in Web Pages

Architecture for Parallel Crawling and Algorithm for Change ...

引用

International Conference on Information Technology (ICIT)

作者： Divakar Yadav A. K. Sharma J. P. Gupta N. Garg A. Mahajan JIIT University Noida India YMCA Faridabad India

In this paper, we put forward a technique for parallel crawling of the Web. The World Wide Web today is growing at a phenomenal rate. The size of the Web as on February 2007 stands at around 29 billion pages. One of the most important uses of crawling the Web is for indexing purposes and keeping Web pages up-to-date, later used by search engine to serve the end user queries. The paper puts forward an architecture built on the lines of a client server architecture. It discusses a fresh approach for parallel crawling the Web using multiple machines and integrates the trivial issues of crawling also. A major part of the Web is dynamic and hence, a need arises to constantly update the changed Web pages. We have used a three-step algorithm for page refreshment. This checks for whether the structure of a Web page has been changed or not, the text content has been altered or whether an image is changed. For the server we have discussed a unique method for distribution of URLs to client machines after determination of their priority index. Also a minor variation to the method of prioritizing URLs on the basis of forward link count has been discussed to accommodate the purpose of frequency of update.

关键词： Service oriented architecture change detection algorithms Web pages Uniform resource locators Crawlers Search engines Bandwidth Web sites Indexing Frequency

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Robust change-point detection and segmentation in data streams

Robust change-point detection and segmentation in data strea...

引用

MILCOM, Military Communications Conference

作者： G.A. Tsihrintzis C.L. Nikias Communication Systems Lab Department of Electrical Engineering University of Virginia Charlottesville VA USA Signal and Image Processing Institute Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

We address the problem of robust detection of those points in time where the statistical properties of an observed time series change. This is a critical theoretical problem in modern statistical signal processing with significant applications in multiple access communication systems and segmentation of multimedia signals, as well as in hidden signal detection, fault detection and diagnosis. We develop new, robust algorithms which maintain a performance close to the corresponding optimum (maximum likelihood) algorithm in the entire class of symmetric, alpha-stable signals and noise. Our algorithms are illustrated via computer simulation, while application on real radar sea-clutter data corroborates our findings.

关键词： Signal processing algorithms Streaming media Communication systems Multimedia systems Signal processing Signal detection Fault detection Fault diagnosis Noise robustness change detection algorithms

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Lane change Maneuver detection from Probe Vehicle DGPS Data

Lane Change Maneuver Detection from Probe Vehicle DGPS Data

引用

International Conference on Intelligent Transportation

作者： Yiguang Xuan B. Coifman Department of Electrical and Computer Engineering Ohio State Uinversity Columbus OH USA Department of Civil and Environmental Engineering and Geodetic Science and Department of Electrical and Computer Engineering Ohio State Uinversity Columbus OH USA

The impact of lane change maneuvers is fundamental to microscopic traffic flow theory. Due to the difficulty of tracking many vehicles over time and space, most of the published research in this area seek to find lane change maneuvers visually from wayside cameras. This paper presents a different approach, finding the lane change maneuvers of a probe vehicle itself using differential Global Positioning System (DGPS) data. We first use multiple probe vehicle trajectories through a study corridor to establish a reference trajectory from the median of all trajectories and this reference trajectory is used to define the position of the current lane. This approach eliminates the need for high-resolution maps accurate enough to capture the exact position of the individual lanes. Our lane change maneuver detection is then divided into two parts, controlling for the impacts of mandatory lane change maneuvers (MLC) and then for discretionary lane change maneuvers (DLC). MLC are detected by comparing the difference between the mean and median of lateral distance of all trajectories relative to a reference trajectory. After distinguishing all the MLCs, the DLC are found by setting lateral thresholds around the reference trajectory, i.e., when a given trajectory leaves this virtual lane. In the process we control for the impacts of GPS errors, such as multipath, arising from obstructions. DLC are then found by comparing the out-of-threshold-line time and length to a threshold acquired empirically from data

关键词： Vehicle detection Probes Global Positioning System Vehicles Vehicle safety Radar tracking Microscopy Traffic control Image processing change detection algorithms

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change-detection in image sequences (medical application)

Change-detection in image sequences (medical application)

引用

Annual Northeast Bioengineering Conference

作者： A. Makki A. El-Fishawy A. Abutaleb C. Hansen J. Siegel S. Kesler Departments of Electrical Engineering Temple University Philadelphia PA USA Department of Electrical and Computer Engineering Drexel University Philadelphia PA USA Temple University Philadelphia PA USA

Two algorithms for the detection of small changes between images in a noisy environment are described. The first is a nonlinear image processing procedure for reduction and/or suppression of background (clutter), and the enhancement of the small difference between two images. This procedure is based on the recently developed Pontryagin filter and concepts of adaptive noise cancelling and image-sequence analysis. The second procedure is linear and is based on a lattice filter structure. The performance is evaluated through computer simulations and real images.< >

关键词： Image sequences Medical services Biomedical equipment Noise cancellation change detection algorithms Working environment noise Image processing Adaptive filters Image analysis Lattices

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Forest cover change detection method using bi-temporal GF-1 multi-spectral data

Forest cover change detection method using bi-temporal GF-1 ...

引用

IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Rongxin Hao Erxue Chen Zengyuan Li Institute of Forest Resources Information Technique Chinese Academy of Forestry College of Geomatics Xi'an University of Science and Technology

ISBN: (纸本)9781509033331

Forest cover will be changed by natural disaster, deforest and other activities. Remote sensing has the ability to monitor the change of forest cover in large area. However, in order to obtain the change information of forest cover, the method for getting the change information from remote sensing images is needed. China has launched GF-1 satellite in 2013, the 16m spatial resolution multi-spectral data of it should be suitable for forest cover detection applications. In this paper, I describe a set of procedures that automate forest cover change detection using a pair of GF-1 images. The proposed method was tailored to work with high spatial resolution images acquired over forest in large area. To achieve a high level of automation, automatic optimum threshold selection algorithm were applied in the processing steps. In this study, an overall change recognition accuracy of 83% has been achieved.

关键词： Remote sensing Satellites change detection algorithms Kernel Radiometry Feature extraction Signal to noise ratio

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The minimal time change detection algorithm for intelligent control system

The minimal time change detection algorithm for intelligent ...

引用

IEEE International Symposium on Intelligent Control (ISIC)

作者： Sungwan Kim Electrical Engineering Department School of Engineering and Applied Science University of California Los Angeles USA

ISBN: (纸本)0780319907

System parameters should be tracked online to build an intelligent control systems even though there exists an abrupt change. For this purpose, a new performance index that we are studying is the speed of adaptation-how quickly does the system determine that a change has occurred? In this paper, a new, robust algorithm that is optimized to minimize the time delay in detecting a change for fixed false alarm probability is proposed. Simulation results for the aircraft lateral motion with a known or unknown change in control gain matrices, in the presence of doublet input, indicate that the algorithm works fairly well. One of its distinguishing properties is that detection delay of this algorithm is superior to that of Whiteness Test.< >

关键词： detection algorithms Intelligent control change detection algorithms Performance analysis Robustness Delay effects Aircraft Aerospace control Motion control Testing

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An Effective Error Concealment Framework For H.264 Decoder Based on Video Scene change detection

An Effective Error Concealment Framework For H.264 Decoder B...

引用

International Conference on Image and Graphics (ICIG)

作者： Ji Zhang Feng Liu Hui Shao Gang Wang Nanjing Univ. of Posts & Telecomm China

In this paper, we propose an effective error concealment framework for H.264 decoder based on the scene change detection. The proposed framework quickly and accurately detects whether scene change occurs in the decoding frame, based on the detection result, both corrupted intra frames and damaged inter frames can be reconstructed by spatial or improved temporal EC (Error Concealment) algorithm. The experiment shows that, compared with the traditional error concealment method in the H.264/A VC non- normative decoder, the proposed framework has better robustness and can efficiently improve the visual quality and PSNR of the decoded video.

关键词： Decoding Layout change detection algorithms Automatic voltage control Video compression Image reconstruction Video sequences Image coding detection algorithms Video codecs

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A change detection approach of high-resolution imagery combined the pre-classification with the post-classification comparison

A change detection approach of high-resolution imagery combi...

引用

International Conference on Agro-Geoinformatics

作者： Ying Jiang Xiongfei Wen Daxiang Xiang Debao Tan Zhe Li Sui Zhang Youchuan Wan Spatial Information Technology Application Research Institute Changjiang River Scientific Research Institute Wuhan China School of Remote Sensing and Information Engineering Wuhan University Wuhan China

This paper presents a change detection approach for high-resolution remote sensing image combined the pre-classification with the post-classification comparison. Firstly, a spectrum correction image is constructed on the basis of fusing the differential and ratio algorithm, which can alleviate the effects of single band's sensitivity. Secondly, a binary change mask is extracted from the spectrum correction image by using Otsu. Then multiply it with the overlaying multi-temporal image to extract reliable change region. Finally, the transference process is realized by using an improved Fuzzy C-Means algorithm. Additionally, considering that Fuzzy C-Means cannot determine the cluster center and cluster number automatically, and also be sensitive to the noise, the article utilizes membership entropy to determine the optimal cluster number, and adopts the max-minimum distance to initialize the cluster center, which can avoid trapping in local optimum caused by selecting cluster center randomly, and also introduces the similarity-weight of the neighbor pixels to correct the membership function. Experiments show that the combination of pre-classification with post-classification comparison can realize the whole change process and also alleviate error propagation effects of multi-classification, which makes the change detection results closer to the real situation. Additionally, the improved Fuzzy C-Means has a better performance in determining the cluster number and center as well as reducing the noise interference.

关键词： Entropy Clustering algorithms Remote sensing Data mining Mutual information change detection algorithms Sensitivity

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Improved change detection with local co-registration adjustments

Improved change detection with local co-registration adjustm...

引用

Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, WHISPERS

作者： Brendt Wohlberg James Theiler Los Alamos National Laboratory Los Alamos NM USA

We introduce a simple approach to compensate for the effects of residual misregistration on the performance of anomalous change detection algorithms. Using real data, both within a simulation framework for anomalous c... 详细信息

关键词： Pixel Laboratories Machine learning algorithms Image analysis change detection algorithms Detectors Eigenvalues and eigenfunctions detection algorithms Multispectral imaging Hyperspectral sensors

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